org.apache.hadoop.dfs.namenode.metrics
Interface NameNodeStatisticsMBean

All Known Implementing Classes:

NameNodeStatistics

public interface NameNodeStatisticsMBean

This is the JMX management interface for getting runtime statistics of the name node. Many of the statistics are sampled and averaged on an interval which can be specified in the config file.

For the statistics that are sampled and averaged, one must specify a metrics context that does periodic update calls. Most do. The default Null metrics context however does NOT. So if you aren't using any other metrics context then you can turn on the viewing and averaging of sampled metrics by specifying the following two lines in the hadoop-meterics.properties file:

        dfs.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
        dfs.period=10
  

Note that the metrics are collected regardless of the context used. The context with the update thread is used to average the data periodically.

Name Node Status info is report in another MBean

See Also:

FSNamesystemMBean

Method Summary

long	getBlockReportAverageTime() Average time for Block Report Processing in last interval
long	getBlockReportMaxTime() The Maximum Block Report Processing Time since reset was called
long	getBlockReportMinTime() The Minimum Block Report Processing Time since reset was called
int	getBlockReportNum() Number of block Reports processed in the last interval
int	getFSImageLoadTime() Time spent loading the FS Image at startup
long	getJournalSyncAverageTime() Average time for Journal Sync in last interval
long	getJournalSyncMaxTime() The Maximum Journal Sync Time since reset was called
long	getJournalSyncMinTime() The Minimum Journal Sync Time since reset was called
int	getJournalSyncNum() Number of Journal Syncs in the last interval
long	getJournalTransactionAverageTime() Average time for Journal transactions in last interval
long	getJournalTransactionMaxTime() The Maximum Journal Transaction Time since reset was called
long	getJournalTransactionMinTime() The Minimum Journal Transaction Time since reset was called
int	getJournalTransactionNum() Number of Journal Transactions in the last interval
int	getNumAddBlockOps() Number of add block operations in the last interval
int	getNumCreateFileOps() Number of file creation operations in the last interval
int	getNumDeleteFileOps() Number of file deletion operations in the last interval
int	getNumFilesCreated() Number of files created in the last interval
int	getNumFilesListed() Deprecated. Use getNumGetListingOps() instead
int	getNumFilesRenamed() Number of files renamed in the last interval
int	getNumGetBlockLocations() Number of NameNode.getBlockLocations(String,long,long)
int	getNumGetListingOps() Number of files listed in the last interval
int	getSafemodeTime() The time spent in the Safemode at startup
void	resetAllMinMax() Reset all min max times

Method Detail

getSafemodeTime

int getSafemodeTime()

The time spent in the Safemode at startup

Returns:

time in msec

getFSImageLoadTime

int getFSImageLoadTime()

Time spent loading the FS Image at startup

Returns:

time in msec

getJournalTransactionNum

int getJournalTransactionNum()

Number of Journal Transactions in the last interval

Returns:

number of operations

getJournalTransactionAverageTime

long getJournalTransactionAverageTime()

Average time for Journal transactions in last interval

Returns:

time in msec

getJournalTransactionMinTime

long getJournalTransactionMinTime()

The Minimum Journal Transaction Time since reset was called

Returns:

time in msec

getJournalTransactionMaxTime

long getJournalTransactionMaxTime()

The Maximum Journal Transaction Time since reset was called

Returns:

time in msec

getBlockReportNum

int getBlockReportNum()

Number of block Reports processed in the last interval

Returns:

number of operations

getBlockReportAverageTime

long getBlockReportAverageTime()

Average time for Block Report Processing in last interval

Returns:

time in msec

getBlockReportMinTime

long getBlockReportMinTime()

The Minimum Block Report Processing Time since reset was called

Returns:

time in msec

getBlockReportMaxTime

long getBlockReportMaxTime()

The Maximum Block Report Processing Time since reset was called

Returns:

time in msec

getJournalSyncNum

int getJournalSyncNum()

Number of Journal Syncs in the last interval

Returns:

number of operations

getJournalSyncAverageTime

long getJournalSyncAverageTime()

Average time for Journal Sync in last interval

Returns:

time in msec

getJournalSyncMinTime

long getJournalSyncMinTime()

The Minimum Journal Sync Time since reset was called

Returns:

time in msec

getJournalSyncMaxTime

long getJournalSyncMaxTime()

The Maximum Journal Sync Time since reset was called

Returns:

time in msec

resetAllMinMax

void resetAllMinMax()

Reset all min max times

getNumFilesCreated

int getNumFilesCreated()

Number of files created in the last interval

Returns:

number of operations

getNumGetBlockLocations

int getNumGetBlockLocations()

Number of NameNode.getBlockLocations(String,long,long)

Returns:

number of operations

getNumFilesRenamed

int getNumFilesRenamed()

Number of files renamed in the last interval

Returns:

number of operations

getNumFilesListed

@Deprecated
int getNumFilesListed()

Deprecated. Use getNumGetListingOps() instead

Number of files listed in the last interval

Returns:

number of operations

getNumGetListingOps

int getNumGetListingOps()

Number of files listed in the last interval

Returns:

number of operations

getNumCreateFileOps

int getNumCreateFileOps()

Number of file creation operations in the last interval

Returns:

number of file creation operations

getNumDeleteFileOps

int getNumDeleteFileOps()

Number of file deletion operations in the last interval

Returns:

number of file deletion operations

getNumAddBlockOps

int getNumAddBlockOps()

Number of add block operations in the last interval

Returns:

number of add block operations